ProtobufQueryHandler.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one.
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.google.code.cxf.protobuf;

import java.io.OutputStream;
import java.io.PrintStream;
import java.util.Map;

import javax.annotation.PostConstruct;

import org.apache.cxf.Bus;
import org.apache.cxf.service.model.EndpointInfo;
import org.apache.cxf.transport.http.UrlUtilities;
import org.apache.cxf.transports.http.QueryHandlerRegistry;
import org.apache.cxf.transports.http.StemMatchingQueryHandler;

import com.google.code.cxf.protobuf.utils.ProtoGenerator;
import com.google.protobuf.Message;
import com.google.protobuf.Descriptors.Descriptor;

/**
 * Query handler for ?proto requests.
 *
 * @author Gyorgy Orban
 */
public class ProtobufQueryHandler implements StemMatchingQueryHandler {
    protected Bus bus;

    public boolean isRecognizedQuery(String baseUri, String ctx,
                                     EndpointInfo endpointInfo, boolean contextMatchExact) {
        if (baseUri != null
                && (baseUri.contains("?") && (baseUri.toLowerCase()
                .contains("proto")))) {

            int idx = baseUri.indexOf("?");
            Map<String, String> map = UrlUtilities.parseQueryString(baseUri
                    .substring(idx + 1));
            if (map.containsKey("proto")) {
                if (contextMatchExact) {
                    return endpointInfo.getAddress().contains(ctx);
                } else {
                    // contextMatchStrategy will be "stem"
                    return endpointInfo.getAddress().contains(
                            UrlUtilities.getStem(baseUri.substring(0, idx)));
                }
            }
        }
        return false;
    }

    /**
     * @see org.apache.cxf.transports.http.QueryHandler#getResponseContentType(String,.
     * String)
     */
    public String getResponseContentType(String fullQueryString, String ctx) {
        return "text/plain";
    }

    /**
     * @see org.apache.cxf.transports.http.QueryHandler#isRecognizedQuery(String,.
     * String, org.apache.cxf.service.model.EndpointInfo)
     */
    public boolean isRecognizedQuery(String fullQueryString, String ctx,
                                     EndpointInfo endpoint) {
        return isRecognizedQuery(fullQueryString, ctx, endpoint, false);
    }

    /**
     * @see org.apache.cxf.transports.http.QueryHandler#writeResponse(String,.
     * String, org.apache.cxf.service.model.EndpointInfo,
     * java.io.OutputStream)
     */
    @SuppressWarnings("unchecked")
    public void writeResponse(String fullQueryString, String ctx,
                              EndpointInfo endpoint, OutputStream os) {
        try {
            Class<? extends Message> messageClass = endpoint.getProperty(
                    ProtobufServerFactoryBean.PROTOBUF_MESSAGE_CLASS,
                    Class.class);
            PrintStream out = new PrintStream(os);
            Descriptor wrapperMessage = ((Descriptor) messageClass.getMethod(
                    "getDescriptor").invoke(null));
            new ProtoGenerator().generateProtoFromDescriptor(wrapperMessage
                    .getFile(), out, wrapperMessage);
            out.flush();
        } catch (Exception x) {
            throw new RuntimeException(x);
        }
    }

    @PostConstruct
    void registerWithQueryHandlerRegistry() {
        QueryHandlerRegistry queryHandlerRegistry = bus
                .getExtension(QueryHandlerRegistry.class);
        queryHandlerRegistry.registerHandler(new ProtobufQueryHandler());
    }

    public void setBus(Bus bus) {
        this.bus = bus;
    }

    public Bus getBus() {
        return bus;
    }
}